Similar to ::textutil::tabify this command tabifies the
string and returns the result as a new string. A different
algorithm is used however. Instead of replacing any substring of
num spaces this command works more like an editor. num
defaults to 8.

Each line of the text in string is treated as if there are
tabstops every num columns. Only sequences of space characters
containing more than one space character and found immediately before
a tabstop are replaced with tabs.

Untabify the string by replacing any tabulation char by a
substring of at most num space chars and return the result as a
new string. Unlike textutil::tabify::untabify each tab is not
replaced by a fixed number of space characters. The command overlays
each line in the string with tabstops every num columns
instead and replaces tabs with just enough space characters to reach
the next tabstop. This is the complement of the actions taken by
::textutil::tabify::tabify2. num defaults to 8.

There is one asymmetry though: A tab can be replaced with a single
space, but not the other way around.

This document, and the package it describes, will undoubtedly contain
bugs and other problems.
Please report such in the category textutil of the
Tcllib Trackers.
Please also report any ideas for enhancements you may have for either
package and/or documentation.

Note further that attachments are strongly preferred over
inlined patches. Attachments can be made by going to the Edit
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar.